在Java中使用ListSelectionListener打印JList選擇字符串

Question

這裏相當新穎。我正在編寫一個GUI程序，我希望能夠使用JButton將所選列表項的字符串（而不是索引編號）附加到文本區域。我不知道哪種Java方法可以讓我做到這一點。當我使用getSelectedIndex方法時，它只允許我將索引號，而不是列表項的字符串值附加到我的文本區域。如果目前還不清楚是什麼我問，這裏是我的代碼：

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
import javax.swing.event.*; 

public class FantasyInterface extends JFrame implements ActionListener{ 

private JList list1; 
private JList list2; 
private JLabel runningbacks; 
private JButton addPlayer1; 
private JButton addPlayer2; 
private JTextArea text; 
String lineSeparator = System.getProperty("line.separator"); 
private String[] rbs = {"Matt Forte", "Arian Foster", "Maurice Jones-Drew", "Adrian Peterson", "Ray Rice"}; 
FantasyTeam team1 = new FantasyTeam(5); 
FantasyTeam team2 = new FantasyTeam(5); 

public FantasyInterface(){ 
    super("Fantasy Football Simulator"); 

    // Set up listsPanel 
    JPanel listsPanel = new JPanel(); 

    runningbacks = new JLabel("Running Backs:"); 
    listsPanel.add(runningbacks); 
    list1 = new JList(rbs); 
    list1.setVisibleRowCount(5); 
    list1.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION); 
    listsPanel.add(list1); 

    addPlayer1 = new JButton("Add To Team 1"); 
    listsPanel.add(addPlayer1); 

    list2 = new JList(rbs); 
    list2.setVisibleRowCount(5); 
    list2.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION); 
    listsPanel.add(list2); 

    addPlayer2 = new JButton("Add To Team 2"); 
    listsPanel.add(addPlayer2); 
    // Add formatted JPanels to Content Pane 
    getContentPane().add(listsPanel, BorderLayout.NORTH); 

    // Set up textPanel, where info will appear 
    JPanel textPanel = new JPanel(); 
    text = new JTextArea(20, 20); 
    textPanel.add(text); 
    // Add formatted JPanels to Content Pane 
    getContentPane().add(text, BorderLayout.SOUTH); 

    ListSelectionListener listSelectionListener = new ListSelectionListener() { 
      public void valueChanged(ListSelectionEvent listSelectionEvent) { 
      //System.out.println("First index: " + listSelectionEvent.getFirstIndex()); 
      //System.out.println(", Last index: " + listSelectionEvent.getLastIndex()); 
      boolean adjust = listSelectionEvent.getValueIsAdjusting(); 
      //System.out.println(", Adjusting? " + adjust); 
      if (!adjust) { 
       JList list = (JList) listSelectionEvent.getSource(); 
       int selections[] = list.getSelectedIndices(); 
       Object selectionValues[] = list.getSelectedValues(); 
       for (int i = 0, n = selections.length; i < n; i++) { 
       if (i == 0) { 
        System.out.println(" Selections: "); 
       } 
       System.out.println(selections[i] + "/" + selectionValues[i] + " "); 
       } 
      } 
      } 
     }; 
    list1.addListSelectionListener(listSelectionListener); 
    addPlayer1.addActionListener(this); 
} 


public void actionPerformed(ActionEvent event){ 
    Object srcObj = event.getSource(); 

    if (srcObj == addPlayer1){ 
     text.append(lineSeparator + list1.getSelectedIndex()); 
    } 
} 

}

最後一部分，

if (srcObj == addPlayer1){ 
     text.append(lineSeparator + list1.getSelectedIndex()); 
    } 

就是我想知道是否有獲得方法以字符串形式選擇的索引。感謝任何人的幫助！

Answer 1

用途：

if (!list1.isSelectionEmpty()) { 
    text.append(lineSeparator + list1.getModel().getElementAt(list1.getSelectedIndex())); 
}